I am following v4 and ASHRAE 90.1 - 2016.
I have an Hotel in Climate Zone 3A, therefore I am using System 2 (PTHP) for Baseline.
In the Hotel, there are VRFs and centralized Outdoor Air (OA) ventilation through FAHUs.
How can I consider the OA in the Baseline model? Should I design an centralized air loop to provide OA? or Should I consider PTHP with local OA supply?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5868 thumbs up
June 3, 2021 - 11:03 am
You never design the baseline system. Model it as required in Appendix G. Unless any exceptions to G3.1.1 apply you model the whole building with PTHPs.
Greenlab
Green Lab6 thumbs up
June 4, 2021 - 5:23 am
I am using Desgin Builder and although the default for the DB's system 2 HVAC design is a version without any fresh air intake, I'm wondering how fresh air can be brought into the building. My question is regarding appendix G, does it preview a fresh air intake from the local unit? Or the baseline in this case doesn't have fresh air intake at all?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5868 thumbs up
June 4, 2021 - 11:51 am
Yes the OA comes in through the local unit. That is usually how a PTHP works.
Tristan Roberts
RepresentativeVermont House of Representatives
LEEDuser Expert
11474 thumbs up
June 10, 2021 - 7:40 am
Good to see you out here, Marcus! I'm replying to this thread just so our profile pics can visit... it's been a while! I hope all is well on the farm restoration project.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5868 thumbs up
June 10, 2021 - 10:06 am
Hey Trinstan, good to hear from you. A lot has happened in my life in the past two yeras or so, basically it was turned upside down but in a very good way. No longer at the farm but am loving life even more. Hope all is well with you!
Greenlab
Green Lab6 thumbs up
June 15, 2021 - 1:30 pm
Glad I could help you reconnect with each other.